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1KGT151085, DECEMBER 19TH, 2019
Application Note
Connecting 23WT25 or 500FSD20 to NSK5
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Table of Content
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1
Introduction
This document describes the connection of a rack-type NSK5 modem to a RTU560 rack-type
23WT25 or EDS500 DIN-rail 500FSD20 serial analog modem. Although the configuration is different 23WT25 and 500FSD20 support the same baud rates and frequencies (channels).
The common compatible transmission modes of the 23WT25 in relation to the NSK5 modem as well as the configuration that is required for these modes is described.
Description of the 500FSD20 configuration is available on request.
1.1
Motivation
Operators of networks in the energy grid rely on serial transmission of data over powerlines to supervise and monitor telecontrol equipment. The interconnection of different communication devices is a key element in maintaining operation of business and investment.
1.2
Modulation
23WT25 and 500FSD20 as well as NSK5 work on the principle of frequency shift keying (FSK), a modulation scheme highly immune to interference and noise.
The principle of FSK is the assignment of a characteristic frequency to a data bit to be transmitted. A logic one (MARK) is assigned to frequency f
L while a logic zero (SPACE) is assigned to a higher frequency f
U
. The frequency f
C
= (f
U
+ f
L
)/2 in the middle of the two characteristic frequencies is called the center frequency. The deviation f d
= (f
U
- f
L
)/2 is the difference between a characteristic frequency and the center frequency. The International Telecommunication Union (ITU) has published several standards based on FSK by its Telecommunication
Standardization Sector (ITU-T).
These standards comprise R.35 for 50 baud communication, R.37 for 100 baud, R.38A and
R.38B for 200 baud and V.23 for 1200 baud. 23WT25 and NSK5 deliver more possibilities than
these mentioned. Refer to section 2.2 for more details.
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2
Configuration
2.1
Setup
Chapter 2 describes the connection of an NSK5 to a 23WT25 modem. It furthermore lists the
compatible transmission modes.
2019-12-19
Figure 1: Communication setup for 23WT25 and NSK5
Both modems can be used in 2-wire as well as 4-wire connection. See Figure 1 for the wiring
scheme. in a point-to-point setup. The NSK5 modem has an optional additional backup line
(denoted by identifier "2") in case the main connection is broken. This switchover circuit is not available on a 23WT25.
A modem at the end of a transmission line has to be terminated correctly. Please see 2.3 for
details for the 23WT25 modem and 2.5 for the NSK5 modem. If a modem is staggered some-
where in the run of a transmission line, it has to be configured to be high-impedant.
Integrated data regeneration is not featured. on the 23WT25. There is also no local test loop according to ITU-T V.54 available for the 23WT25 modem.
4 / 20
2.2
Supported channels and frequencies
23WT25 and NSK5 support mainly the same center frequencies and deviations. The NSK5 also supports center frequencies above the ITU-T telecontrol and data band which reaches up to
3240 Hz. Only 600 baud and 2400 baud are not compatible to each other. A compatible 1200 baud plus speech option is not available on the 23WT25.
Baud rate 50 100 200
200/
300
1200
NSK5 ± 30 Hz ± 60 Hz ± 90 Hz ± 120 Hz ± 400 Hz
23WT25 ± 30 Hz ± 60 Hz ± 90 Hz 1 ± 120 Hz ± 400 Hz
1620
1740
1860
1980
2100
2220
2340
2460
2580
2700
420
540
660
780
900
1020
1140
1260
1380
1500
2820
2940
3060
3180
3300
3420
3540
3660
3780
3900
480
720
960
1200
1440
1680
1920
2160
2400
2640
2880
3120
3360
3600
3840
540
900
1260
1620
1980
2340
2700
3060
3420
3780
600
1080
1560
2040
2520
3000
3480
1700
Table 1: Supported center frequencies and deviations per baud rate for 23WT25 and NSK5
2019-12-19
1 Included in narrowband firmware release
5 / 20
2.3
Configuration of the 23WT25 modem
The 23WT25 modem is configured by jumpers. For an in-depth description of all settings please see the connections and settings document 1KGT 150 592. In this document only basic settings for the interoperation of 23WT25 and NSK5 are described. The position of jumpers
Figure 2: Jumper layout 23WT25
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2.3.1
Configuration of baud rate
Transmission on the 23WT25 is fully bit-transparent, i.e. the duration of one bit on the serial interface directly corresponds to the time during which the respective frequency is present on the transmission line.
Therefore, data transmission is possible for any baud rate smaller or equal than the configured baud rate. Configuration of the transmit baud rate is done via jumpers X2-6 to X2-8 while the receiving baud rate is configured by jumpers X3-6 to X3-8.
Please take jumper settings for baud rate configuration in transmit and receive direction
Jumper
X2-6 to X2-8 / X3-6 to X3-8
1
2
3
8 7 6
· · ·
· · ·
· · ·
1
2
1
2
3
8 7 6
1
2
3
· · ·
· · ·
· · ·
1
2
3
8 7 6
· · ·
· · ·
· · ·
8 7 6
· · ·
· · ·
· · ·
3
8 7 6
· · ·
· · ·
· · ·
Baud rate
50 Bd.
100 Bd.
200 Bd.
300 Bd.
1200 Bd.
Standard
R.35
R.37
R.38A
R.38B
R.38A
V.23
Table 2: 23WT25 Configuration of baud rate
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2.3.2
Configuration of frequency
The center frequency of the transmitter is configured by jumpers X2-1 to X2-5 while the re-
ceiver is configured by X3-1 to X3-5. Table 3 shows the corresponding jumper settings for the
possible center frequencies.
1
2
3
1
2
3
1
2
3
1
2
3
3
1
2
3
1
2
1
2
3
1
2
3
1
2
3
1
2
3
Jumper
X2-1 to X2-5 /
X3-1 to X3-5
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
R.35
50 Bd.
420 Hz ± 30 Hz
540 Hz ± 30 Hz
660 Hz ± 30 Hz
780 Hz ± 30 Hz
900 Hz ± 30 Hz
1140 Hz ± 30 Hz
R.37
100 Bd.
480 Hz ± 60 Hz
720 Hz ± 60 Hz
960 Hz ± 60 Hz
1200 Hz ± 60 Hz
1440 Hz ± 60 Hz
1920 Hz ± 60 Hz
1020 Hz ± 30 Hz 1680 Hz ± 60 Hz
600 Hz ± 120 Hz
540 Hz ± 90 Hz 2
1080 Hz ± 120 Hz
900 Hz ± 90 Hz 2
2040 Hz ± 120 Hz
1620 Hz ± 90 Hz 2
2520 Hz ± 120 Hz
1980 Hz ± 90 Hz 2
3000 Hz ± 120 Hz
2340 Hz ± 90 Hz 2
1260 Hz ± 30 Hz 2160 Hz ± 60 Hz 3060 Hz ± 90 Hz 2
1380 Hz ± 30 Hz 2400 Hz ± 60 Hz
1500 Hz ± 30 Hz 2640 Hz ± 60 Hz
R.38A/R38B
200/300 3
2
Bd.
1560 Hz ± 120 Hz
1260 Hz ± 90 Hz
2700 Hz ± 90 Hz
2
2
V.23
1200 Bd.
1700 Hz ± 400 Hz
2 Included in narrowband firmware release
3 300 Bd. not available with narrowband firmware release
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2019-12-19
1
2
3
1
2
3
3
1
2
1
2
3
1
2
3
3
1
2
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
3
1
2
1
2
3
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
1620 Hz ± 30 Hz
1740 Hz ± 30 Hz
1860 Hz ± 30 Hz
1980 Hz ± 30 Hz
2100 Hz ± 30 Hz
2220 Hz ± 30 Hz
2340 Hz ± 30 Hz
2460 Hz ± 30 Hz
2580 Hz ± 30 Hz
2700 Hz ± 30 Hz
2820 Hz ± 30 Hz
2940 Hz ± 30 Hz
3060 Hz ± 30 Hz
2880 Hz ± 60 Hz
3120 Hz ± 60 Hz
9 / 20
1
2
3
5 4 3 2 1
· · · · ·
· · · · ·
· · · · ·
3180 Hz ± 30 Hz
Table 3: 23WT25 configuration of center frequencies
2.3.3
Configuration of the serial interface
The jumpers for serial interface configuration have to be placed into the default position. See
Jumper
X7-1 to X7-7
Signal Definition
X7-1
3 2 1
· · ·
CTS CCITT standard
X7-2
3 2 1
· · ·
DCD CCITT standard
X7-3
X7-4
3 2 1
· · ·
3 2 1
· · ·
RxD CCITT standard not used
X7-5
3 2 1
· · · k1
DCD alarm delayed,
SQL alarm (X5-7=1-2)
X7-6
3 2 1
· · ·
RTS CCITT standard
X7-7
3 2 1
· · ·
TxD CCITT standard
Table 4: 23WT25 configuration of serial interface (default position)
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2.3.4
Configuration of 2-wire and 4-wire setups
The modem 23WT25 can be operated in 2- and 4-wire mode in a point-to-point or multidrop topology. The jumper configuration for the different modes and topologies can be taken
from Figure 3, Figure 4, Figure 5 and Figure 6.
Figure 3: 23WT25 Two-wire mode, point-to-point
Figure 4: 23WT25 Two-wire mode, multidrop
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Figure 5: 23WT25 4-wire mode, point-to-point
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Figure 6: 23WT25 4-wire mode, Multidrop
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2.4
Configuration of the 500FSD20 modem
The 500FSD20 DIN-rail device is a fully software configurable analog modem. Information on configuration for NSK5 is available on request.
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2.5
Configuration of the NSK5 modem
The NSK5 modem is available in the variants G4AE, G4AF (refer to Figure 7) and G4AK (refer to
Figure 8). For an in-depth description of all settings please see the Instruction Manual docu-
ment 1KHL 015 989. In this document only basic settings for the interoperation of 23WT25
Figure 7: Jumper layout NSK5 G4AE and G4AF
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Figure 8: Jumper layout NSK5 G4AK
2.5.1
Configuration of baud rate
The baud rate of the NSK5 can be selected by switch positions 1 to 3 at the switches S1
(Transmit channel) and S2 (Receive channel) as listed in Table 2. For simplicity, only baud
rates compatible to 23WT25 and 500FSD20 are listed.
Switch S1/S2 Baud rate Standard
1 2 3
On On Off 50 Bd.
Off Off On 100 Bd.
R.35
R.37
Off On Off 200 Bd.
Off On On 200 Bd.
R.38B
R.38A
On Off Off 300 Bd.
R.38A
On On Off 1200 Bd.
V.23
Table 5: NSK5 configuration of baud rates
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2.5.2
Configuration of frequency
The frequency of the NSK5 can be selected by position 4 to 8 of the switches S1 (Transmit
channel) and S2 (Receive channel) as listed in Table 6 and Table 7. For simplicity, only frequen-
cies compatible to 23WT25 and 500FSD20 are listed.
Switch S1/S2 R.35
50 Bd.
R.37
100 Bd.
R38B
200 Bd.
R38A
200/300 Bd.
4 5 6 7 8
Off Off Off Off On 420 Hz ± 30 Hz 480 Hz ± 60 Hz 540 Hz ± 90 Hz 600 Hz ± 120 Hz
Off Off Off On Off 540 Hz ± 30 Hz
Off Off Off On On 660 Hz ± 30 Hz 720 Hz ± 60 Hz
Off Off On Off Off 780 Hz ± 30 Hz
Off Off On Off On 900 Hz ± 30 Hz 960 Hz ± 60 Hz
Off Off On On Off 1020 Hz ± 30 Hz
900 Hz ± 90 Hz
1080 Hz ± 120 Hz
Off Off On On On 1140 Hz ± 30 Hz 1200 Hz ± 60 Hz 1260 Hz ± 90 Hz
Off On Off Off Off 1260 Hz ± 30 Hz
Off On Off Off On 1380 Hz ± 30 Hz 1440 Hz ± 60 Hz
Off On Off On Off 1500 Hz ± 30 Hz 1620 Hz ± 90 Hz
1560 Hz ± 120 Hz
Off On Off On On 1620 Hz ± 30 Hz 1680 Hz ± 60 Hz
Off On On Off Off 1740 Hz ± 30 Hz
Off On On Off On 1860 Hz ± 30 Hz 1920 Hz ± 60 Hz 1980 Hz ± 90 Hz 2040 Hz ± 120 Hz
Off On On On Off 1980 Hz ± 30 Hz
Off On On On On 2100 Hz ± 30 Hz 2160 Hz ± 60 Hz
On Off Off Off Off 2220 Hz ± 30 Hz
On Off Off Off On 2340 Hz ± 30 Hz 2400 Hz ± 60 Hz
On Off Off On Off 2460 Hz ± 30 Hz
2340 Hz ± 90 Hz
2520 Hz ± 120 Hz
On Off Off On On 2580 Hz ± 30 Hz 2640 Hz ± 60 Hz 2700 Hz ± 90 Hz
On Off On Off Off 2700 Hz ± 30 Hz
On Off On Off On 2820 Hz ± 30 Hz 2880 Hz ± 60 Hz
On Off On On Off 2940 Hz ± 30 Hz 3060 Hz ± 90 Hz
3000 Hz ± 120 Hz
On Off On On On 3060 Hz ± 30 Hz 3120 Hz ± 60 Hz
On On Off Off Off 3180 Hz ± 30 Hz
Table 6: NSK5 Configuration of frequency
Switch S1/S2
4 5 6 7 8
V.23
1200 Bd.
On X X X Off 1700 Hz ± 400 Hz
Table 7: NSK5 Configuration of frequency for V.23
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3
Verifying operation
Operation can be verified by observing the LEDs. On the 23WT25 RTS and CTS light up when data is going to be sent via the connected data terminal equipment (DTE). The TxD led should only be flickering while RTS and CTS leds are on. On the NSK5 modem the DCD led should be on during this time, and the RxD led should be flickering according to the TxD led of the
23WT25. As soon as the DTE attached to the NSK5 starts answering the DTE attached to the
23WT25, the RTS led of the NSK5 will be switched on, and the TxD led will be flickering during this time. In return, the DCD led on the 23WT25 modem will be switched on now, and the RxD led of the 23WT25 will flicker according to the TxD led of the NSK5. On the 23WT25 the SQ led should stay off during the complete reception period as long as pauses between transmissions are short enough not to trigger the delayed DCD alarm.
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4
Ordering Information
For order numbers regarding the analog modems the table below can be used. NSK5 is end of sale.
Product Ident no Description
23WT25 R0001 1KGT012400R0001
500FSD20 R0001 1KGT039200R0001
NSK5 G4AE R0005 HENF209637R0005
NSK5 G4AF R0005 HENF209638R0005
RTU560 plug-in modem 23WT25
NSK5 FSK modem
NSK5 FSK modem
500FSD20 analog DIN-rail modem
NSK5 FSK modem with alternate route selector
NSK5 G4AK R0001 1KHL016009R0001
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5
References
Product Reference(s)
23WT25 Datasheet
Connections and settings
Datasheet
1KGT 150 591
1KGT 150 592
1KGT 150 986 500FSD20
NSK5
Contact
Instruction Manual
Technical questions:
Comercial topics, orders:
Further information: [email protected]
https://solutions.abb/eds500
1KHL 015 989 [email protected]
2019-12-19 19 / 20
—
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P.O. Box 10 01 64
D-68128 Mannheim
Germany solutions.abb/eds500
—
We reserve the right to at all times make technical changes as well as changes to the contents of this document without prior notice.
The detailed specifications agreed to at the time of ordering apply to all orders.
ABB accepts no responsibility for possible errors or incompleteness in this document.
We reserve all rights to this document and the topics and illustrations contained therein. The document and its contents, or extracts thereof, must not be reproduced, transmitted or reused by third parties without prior written consent by ABB.
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